Install libthunarx-2-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libthunarx-2-dev
Description:
Development files for libthunarx
This package contains the headers and the static library for libthunarx, the extension library used by thunar
Homepage: http://thunar.xfce.org
Version: 1.6.15-0ubuntu1
Section: universe/libdevel